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Related Concept Videos

Photoreceptors and Visual Pathways01:22

Photoreceptors and Visual Pathways

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At the molecular level, visual signals trigger transformations in photopigment molecules, resulting in changes in the photoreceptor cell's membrane potential. The photon's energy level is denoted by its wavelength, with each specific wavelength of visible light associated with a distinct color. The spectral range of visible light, classified as electromagnetic radiation, spans from 380 to 720 nm. Electromagnetic radiation wavelengths exceeding 720 nm fall under the infrared category,...
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Visual System01:26

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Light enters the eye through the cornea, a transparent, dome-shaped surface covering the surface of the eyeball that helps to direct and focus incoming light. This light is then channeled toward the pupil, an adjustable opening whose size is controlled by the iris. The iris, a pigmented muscle, regulates the amount of light entering the eye by contracting or dilating the pupil, thereby ensuring optimal light levels for clear vision.
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Vision01:24

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Vision is the result of light being detected and transduced into neural signals by the retina of the eye. This information is then further analyzed and interpreted by the brain. First, light enters the front of the eye and is focused by the cornea and lens onto the retina—a thin sheet of neural tissue lining the back of the eye. Because of refraction through the convex lens of the eye, images are projected onto the retina upside-down and reversed.
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Visual Agnosia01:12

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Visual agnosia is a condition characterized by the inability to recognize visually presented objects despite having normal vision. For instance, a person with visual agnosia can describe the shape and color of an object but cannot identify or name it. This impairment does not affect their visual field, acuity, color vision, brightness discrimination, language, or memory. An example of this condition in a social setting is someone at a dinner party asking for "that silver thing with a round...
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Focusing of Light in the Eye01:16

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Light rays enter the eye through the cornea, a transparent dome-shaped tissue that is the eye's outermost layer. The cornea bends or refracts, light rays traveling to the pupil. The shape of the cornea determines how much of the light is bent and whether the image will be focused correctly on the retina at the back of the eye. Once the light has passed through both refraction layers, it converges into a single focal point onto a small area. This is where photoreceptors start transforming...
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Anatomy of the Eyeball01:20

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The eye is a spherical, hollow structure composed of three tissue layers. The outer layer — the fibrous tunic, comprises the sclera — a white structure — and the cornea, which is transparent. The sclera encompasses some of the ocular surface, most of which is not visible. However, the 'white of the eye' is distinctively visible in humans compared to other species. The cornea, a clear covering at the front of the eye, enables light penetration. The eye's middle...
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Updated: May 17, 2025

Development of a Gaze-Contingent Display Framework Designed for Perceptual and Oculomotor Research with Simulated Central Vision Loss
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Disorders of Higher-order Visual Function.

Victoria S Pelak

    Continuum (Minneapolis, Minn.)
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    This summary is machine-generated.

    Understanding higher-order visual disorders is crucial for timely diagnosis and treatment. Recognizing symptoms and using proper assessment tools can prevent visual disability.

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    Area of Science:

    • Neuroscience
    • Ophthalmology
    • Neurology

    Background:

    • Advances in visual neurosciences enhance understanding of visual neurons and therapies for cortical neuron diseases.
    • Higher-order visual regions exhibit functional specialization, with distinct networks for processing visual information.

    Purpose of the Study:

    • To provide an overview of higher-order visual disorders, including clinical features, assessment methods, localization, and etiologies.
    • To review the organization and properties of the brain's visual system for improved recognition of visual dysfunction.

    Main Methods:

    • Review of current literature on higher-order visual function.
    • Analysis of neuroscientific and clinical data regarding visual processing pathways.

    Main Results:

    • Damage to the occipitoparietal pathway impairs motion and visuospatial processing.
    • Damage to occipitotemporal regions causes visual agnosia, affecting object, color, and facial recognition.
    • Higher-order visual dysfunction symptoms can mimic ocular disorders, necessitating specialized assessment.

    Conclusions:

    • Recognizing higher-order visual dysfunction requires understanding visual neuroanatomy and neuronal properties.
    • Integrating higher-order visual function assessment into neurological exams can prevent diagnostic delays.
    • Early identification and intervention are essential for preventing disability associated with visual processing impairments.